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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ee8e6b1569157e4d00552772e1c76a7a091891f2d1aa0cde9cf37f6b689160' 
  AND token = 'Dsovfn2eeWatCY1FQIUlK7ReadlTIEHwxRAR9YBzrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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