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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4901050da13e573222b1dbbea48ac894a9518f684d83889ab4be0857f4eb5437' 
  AND token = 'PPFvCLQhA2DWnUdxwT//fcFx7X7prQKTM9ymhH+LCMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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