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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc6130ef1183a6846476d450652d3291bcee22f1e2e6d048a9badeae0f3322d' 
  AND token = 'Hdfh1fnKLFXVBAdkssAr4cLvLty8SoKElDkHzNq31lA=' 
  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"
    }
  }
}