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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c63fd862b173ae6f2b50f86b7c7195a815adf71f62a1492a4c381c84b10b772' 
  AND token = 'DEZmZwRCZTCrLrvoLXHK9XyvHo6BzcEsWG6kou1KaRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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