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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee8a23d42be71303144ce180520772b7e27db45459b661742438991aaba96f8' 
  AND token = 'MR5Pp+T/lm3siOl4+bRH3zB8GowGmmi1CNwDyLrankM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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