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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '10508b5cecfff8e00c7d59dd87c1c6f71c44b5c8b5cf7fc2aaee0d68e2ef4f83' 
  AND token = 'wLSCGvt/+yEO/dF6s0M1qXDnBSYSU5DJayVq+x3Eja8=' 
  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"
    }
  }
}