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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ea179e2ee72fb1947c15a5bb641cf2827d9d0bce206ec7f9bacfd63040c600' 
  AND token = 's4TUNaQP9KrTHS1tHJV5+/1V86PyDW6J+rPGdq+c86U=' 
  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"
    }
  }
}