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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66095b4a65a45ee4a55c5bdc102d42ca0d95f5b20c47e36fae685eb6397a855b' 
  AND token = 'pA8MkS5jLHxwe4xGo+knrTOYZWEgTwsagbMZduUHk4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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