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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a43a3f908032972e122c28313ba11dd98c3f2207986a89b3273a71d62f08f2' 
  AND token = 'u9aiwT31yTJWVL3mX3a4P9TAgwDrUWSm6v2/d/zaP1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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