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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2310582044d61153a6df2d87a9efd25673e6a47519cec9fffdbbf5c133b07f42' 
  AND token = 'hR7X+XUFXC61Nctyye02+IM1OWAwXQOiJpHSbEXMi4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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