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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b1261f0662170bc9c96abe23eeac24102b6861584c702b4e5000b8c8b79500' 
  AND token = 'mqg7D8/dX9jZQHo61Fn4rCgPKYVp8ZAFk4o1J4SuDW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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