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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc5cc752f8bf6c556add1eb6fa79b49bd3b29e6d9bd6c60624a51e7a96f46fd' 
  AND token = '8iRXuzlDYBUEDqJtHiA0KGIHHABN3WOa/cufmbqvUHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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