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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481f96175546eeb3861949ec3b2743ed48983e7c0de2682b55d94d4698f39915' 
  AND token = 'kqXTtv7clW7xanuR9fDZbl95fk4pbYaE+ulHI4X9dMg=' 
  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"
    }
  }
}