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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8ab9eb17e0a06365de6a351fe509fa2e18105b21e51625e9d86c902dc1aa2a' 
  AND token = 'eumo5ICLHkx5mlZK3iwD/HF8A66tKtRqcP5KlYbD/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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