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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3506da0b0c35b59bbc549e767ac788a51b7dcc1bf453fcfcb78ae6e16ee8b8f1' 
  AND token = 'hpwpZIRAr5Tqfm00mdaAKaBrC3/KJ8ezz1kQguuWtjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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