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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42673e7542551ecfa1e40a1de49667530875e98690fbe3cb926e2fb3b1ea206a' 
  AND token = 'pkvj1liwp7de3GUE6ePL1X4+2PArt7V90Iotb3pZayA=' 
  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"
    }
  }
}