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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8368d8a3dc0944a5cd2b7acfd4a1b9bd40a6a92b716ad47f522d77c52aaff42' 
  AND token = 'TPIT1lNnMV68bqm2vCX+YNZtyUJlQA26tzn8chZkKwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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