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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b87e65e24b82548f632e90bfb5e033a9b63cc0cdb33e977a90f9e9f1b1e9d470' 
  AND token = '7Gp1Ca0piVtiXDwrmSVa8gBY4a8/eHaa/OnkCOtGEf4=' 
  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"
    }
  }
}