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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e35b4761b09581ee29cef350b93f66f933f269ea90ff524f4ef137cb17ef6190' 
  AND token = 'BFSQZ/Mhn4T7OxaMd4Jf4WtPZN+A4CA6TS1Pd4Uw55c=' 
  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"
    }
  }
}