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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ed490cfe4679cbfd1117847e06b3aa67e663b1973427b1d4fb4f7fe62b58cb' 
  AND token = 'zQV0AsNWEtCf5jv19iA6P9X6Nzdsxry/t5CnZ+VbLW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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