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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbae4c3105af6aa38ffb9a3f231fafe5ec7b253e6713a6ff735db9a6f50a42b9' 
  AND token = '6fdwJUe/UqPt8WU2L0T3LrHlyQqdT2ALBF2R6r6c4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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