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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '43a90f06f12955654d0c1c06e24364252fcd79785b7b08ccb1d8ebd12decf707' 
  AND token = '2DtdU8BeW6k5zPBJfDr56ifARgnF+lx48ZqMTGQ88pM=' 
  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"
    }
  }
}