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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42539d367098d0957e341da81adc75c304c888fcac355b362c6a8944fd41ec1d' 
  AND token = '9InUFCQ4XHUovGx0Ic2q8lDsL9Tc2GbBOInWm6rj0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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