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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd315b72be21a179e613ab37a80d2c6e5c9e8d0ce7234cf8356b2a5b1d3925544' 
  AND token = 'CHg0btNTejo4WMeXS5KMLvRBMfPZx1mhq0pEn6SfyEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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