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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd090fbe2b2cc1a770f530c36abf08415d96b1a8f6b708c75b9f1c29ba73b17' 
  AND token = 'xDdwNjme0O29fU4XFKEgI5Y/ZZzAuOpAsEfqR/W4Q+A=' 
  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"
    }
  }
}