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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842957aebe41c46381f973c81d6726983c74aacb08a8699708715257eaa609f0' 
  AND token = 'ee+Y+ydN4sUIR6Qhk7bMK1m+MlqDXjmz3vhDU1dwhEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}