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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4574fac8e8d12c1836b23a28858c49d6d8e3f86e84ea7e565347255620191cb' 
  AND token = 'yPm0jDsNx3FGERyLJxIpeD/CwM6wtGkwFwif57UTOM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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