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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775d7330bb80ea3aff2ec8bc9e0e745974623b9c2d1fdcf9ed81e4700f5c98e8' 
  AND token = 'Qwsj1np7m3J7XMTIP2W3+XFAKHFaFI5IU9g5OjOBhPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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