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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ae3c8dddb0495e1ea9e31d6da30cd42cfcfe4266b1bf59c339276b0dc62adf' 
  AND token = 'iqibaf089wNb2vKZ9MlmUDu48PgxyRa6KZE0maLk+6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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