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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c8beb308ecd4435d61e888f283f34d4884554f3e97e9c2d9a93b9e0b4534c82a' 
  AND token = 'x/xINu46/mrtHGCyqrt2XztXx2gLAmuND5EwmOhGrDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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