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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '97e3a5dc017cb0d79947808dcec31d60bebbb34c5c42a3d6905e2546137467c0' 
  AND token = 'QVQNc2ky+8FuT7DCba/m2Zk7vVtjMLkmq7EyK+vM9ms=' 
  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"
    }
  }
}