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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cac40003aa5e2fa6a874f1e625d506e22c1552b721306a2ff6e5610f7058919' 
  AND token = 'HbczTTsnYjmgYwa57W9Fxm6RneS3nUF9ZBUjRvv7V88=' 
  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"
    }
  }
}