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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea19036b7fafe42929c2c1b6fa305625ec88367b3e4478215e5a7ca1758f3a2' 
  AND token = 'IZ4OKEPdbb5/6fBnwxFwJqG0bS/56xpIJ7P5i28ggF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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