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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b91d343860f89b998305c6105487d65a8b3228d126f822e07a12be84a2c6ee0' 
  AND token = 'cMwkOVwpHRNJ9jZHSbhfNj6kDvyMDr8OHUaW6dzMIVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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