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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8904aae0ad0bb1257c024bf9e6a2ff2690802a6a228dd244c47770765ae8ebf2' 
  AND token = 'v13nGl3oK/iCqo6hi+duBCRewcOt4xFlQNiZx2LiYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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