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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b50be1550c457de0b741dfa5e5a22a30f1316effb083a2af2155f860f50f1ae' 
  AND token = 'nd3J8l2YZWjOlwdfsaaiLi1J5Xn8Wsh7LvdpJp6XTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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