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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e76a864ca1f07a879d2cfc87510d9ddf2f9487a8fb16d1f0120c7dba11da616' 
  AND token = 'VEa3sNLIfwe1NsapYs2chzxN1SOv6SoJOvUIykALIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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