SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2ba44b1dd8bd22be1985584bc01e6ee910dd75a8ff6ab034640341ff532c93' 
  AND token = 'zYibVNG+GsJlqwPhkkjmr6IQRJdNbzRdYpRapmudvpI=' 
  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"
    }
  }
}