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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca78f5d2781ba95848bcd4d0d3e4fb31ca05e6596430315d14f03e42d71e8b0' 
  AND token = 'w9tk0TUQzO2vlKAkjgpuWJH07/mzW9bqdUpQj3uExzs=' 
  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"
    }
  }
}