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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cbd8c2a67bb95900b2109530b532a6e8835aec576c5001355b0607b76acca7' 
  AND token = 'yJPvYUxV0Uf3k8md7slVgoqAtQ/GY9P+VujtKHhNFaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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