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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2af1f66c42d5cc8f3341fa3604c87ebb1852492f125a04c67af1af44e01ea89' 
  AND token = 'MnXnvKjojSrG7blimkdL5dVdk5qWWWQWOYAlCaITrmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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