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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76dcefb0f5543509ac0476b51b46e61a1fff7d7dcb5bb5f9c4461297fef2d50' 
  AND token = 'XRtvGEYULG9DLSafnBt3CNbVc7GXJz9H9lyiVXaJOUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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