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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540826ec056af8047ed3f8b2ac2960c2e609fca57362d8e3b177dbba49085452' 
  AND token = '7UArzAsEYJB0Fvcd+Xdi25pu9P/05l/5IZ0QZN+WiXU=' 
  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"
    }
  }
}