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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d535696981d102dc7cbb6d1c0c91d50aef1e2faa390477e2a2b11c8b07c7009' 
  AND token = 'fT0+/bwcScUQup6Na17I6xLjqZdCF44jMT5kfhe+9Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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