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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f346d649847e6ff6ad54145757e6ca55adb52b674ce7c21238b15a342fd44a' 
  AND token = 'I2O8PcLG1pryD4yB6R0p/2Wby+awUeiYsgD3S2EbJxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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