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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9d62ed5214dcd314ccc20a607164a8a35390c2964f71f7142a5ac915396462' 
  AND token = 'WPC5/aFwlvxBCB71r9le2q0GmQbC8A4BfO6XuQlDYhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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