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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99634dedd3f5553a02c23d22655e3d64a1e992f168ef32ac6c8eae722f4711c5' 
  AND token = 'zbNK6YMG9boM5TcO+kLSiiaVCyQpWK7ERJagb/Rs18Y=' 
  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"
    }
  }
}