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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0d6d36eead415e4275d3aa717549c13494c2e715bfc38f6b44d2364bbc5c32' 
  AND token = 'F6Sz1CBcBe7uyp21P5YBmqGDVRP8dJW7UEUGOVTxedc=' 
  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"
    }
  }
}