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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f0100a31c0e1b04a6337bbf0e4efc5d00bbf90e7a728d839372b5b60cd4101' 
  AND token = 'adbZqTpABaoJgp9mh6GjJ6cyekK575ESU0V+t8+sN4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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