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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac4a6815bce9dac68e9a9e4ffaaa9bca57b665ecbc4f980835ff4f7c8851784' 
  AND token = 'jhgQXteHpKybR33p924GT8fKlkYQ7OfqsdSQWqoOQVg=' 
  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"
    }
  }
}