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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5e5dfb6b8d104eb133f046b83d3cdb69650151790142a264dab54d3bd2e976' 
  AND token = 'UM/dacaGgHC0uhvBQzcOuXRpGAU4dQeouVG8Pn5dAG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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