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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195c2aa40bd052404ddd3a9c2b0af13d342e9d298b346e0eeb2cda169bc6cc7e' 
  AND token = 'SCnDBCMoMK7An7PzjtbIF68iXpuwwt7yfPIsBx284S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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