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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de130ddde09b126b24e0b4a2b40126dc2fc41ed6f85156819cbedbb8023d9cd3' 
  AND token = 'z+UVTFYI9ozW/OpLvRseSQ1VpnL9hfCxieSFKi+jSsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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