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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54bf63e70c9476301e4e46cf4f4cb1fe7678678c4f881cbda8f0fdead5740f0' 
  AND token = 'oMXHw6kf5bHRm6uvQ0a0wnUjEraiUZQp3WaEHH4MFPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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