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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6f1a63e2f40adc8ab81e3d2c745bd4b5e65442eed40ef5f3f12d35686ea43a77' 
  AND token = '2AM5SFrj7hmJQ+ppcbNXkkCE+up4p1/h7fl55rZDKb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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