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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c538b74d41c22650fb62bcf1614bd6a7aa720556bffcf77ab6e5c7f6f4744dad' 
  AND token = 'ErXcGTy9ev4c1cMFvV0Iqso3E+1VS+ocqOEm/qcBI4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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