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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4188e436ca721ddc1647a6914a5d689d3fd127bcd6c0da8f4b5bf237e83278f8' 
  AND token = 'JtTg9WcYJjKdIp11g9Ee1j/YTQJAQkZDK0Lscfuq6Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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