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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8247ce09265351ebb5bb7d239500acc09468bfe169d2f6f6b8315a3ff4fee28c' 
  AND token = 'uVz4PJH6uKM7M5R8o0ZzjnXP205krE2UMfhsIaSdc9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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