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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934ecadbe4eef700bb4d53bba4691f64a3673e6a5fe2ebfd98dc0315a3ce3776' 
  AND token = 'sfrVh6YAsgcL46QcIia0V3K4Lr0aysSeCdbDOvdB0Tk=' 
  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"
    }
  }
}