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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'baa12c4a502f50f1166cb015c9c11bc741e84c0e867d76cb0cb1121844709a54' 
  AND token = 'XfTgD0lnOeGP4Pe7g8BYBrfipQvbzLMX4EJ90yeCewE=' 
  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"
    }
  }
}