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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fc5b2608fe9e10761e26252b9dd347b7a42866a55cf9bf76561b8b4d5b4510a8' 
  AND token = 'E4V2Wu1+jVCkO4av0P/NngDH6xRr3VcrEX/0O3S9kUM=' 
  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"
    }
  }
}