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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e0755d4e1b1fc13939048f3397de97acc99d06862ffd460ed2492385f79c05' 
  AND token = 'MPB5xgty4G9hCmfHER+MXUMA5ISBTzwu33PCfwofnFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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