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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '21c20425b64a4cfa9818a1a8359ba9d7f3dea500ac4c18ccb9039f1bde04f43c' 
  AND token = 'tfRUx/el7Mdspr8K18U9ZsGwvECIWDTwM3PkumBi4EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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