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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6b7e5b56390cba04cf7579b673ece3d10d1f26d7e38da8162b3de9d5f65239ed' 
  AND token = 'phMRt0qaprEy1ZCag56pSv6uMIBHNQVrZjM0Hc1Yi6Q=' 
  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"
    }
  }
}