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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f21b51e43ca8e3502a1eb42150c87c78add21af8385874633fff7615ab7bd4e' 
  AND token = 'f9j2qrCjY0BBuUex/rFI/qMkFgfHezOb7dT9Dc1/EAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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