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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b99784860cfd62705262271e508447645443ab643cde2038359bc883551eecc2' 
  AND token = 'KBApl87w64Ia4RsIvrGNV07wsKeOntNnpF1SBW7RfPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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