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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c579ed0861d29eb72f57e4a7fa73cad509f2791710e2799e8ffc8eb4aea7d4' 
  AND token = 'Tgl1R7nSLNwmAPomcFuIfzttYKimPirL8RUF1D6Dq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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