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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02294b337f6e6d3c411a199cc48b93eccc431ec5f33b5434ec5bc2a92e519d9f' 
  AND token = 'ITDeeFIR6miNRVNzHr5ACePKPi36CD9UmzJVumbI9Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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