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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f83b52797603a792f80716e440318e6ce41015fa99befd1b9ed13efd20b795' 
  AND token = '/EIuLD4nY+fTl2dj0ds2nu3wffjZ5ae8SjOxunAcaWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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